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GoSouthYoungins

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Re: The 2018/2019 freezing season
« Reply #1050 on: January 21, 2019, 07:49:15 PM »
If the expected movement continues, by melting season there will be no thick ice with a good chance to survive the melt ANYWHERE on the Russian side of the north pole. (maybe a little bit on the border of ESS/Chukchi, but it continues to move toward an area which reliably melts.) Decent chance we see an ice shape similar to the "2030 outline" come September.
big time oops

uniquorn

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Re: The 2018/2019 freezing season
« Reply #1051 on: January 21, 2019, 08:10:29 PM »
That's quite a big chunk out of the Lincoln sea today. https://go.nasa.gov/2U8m9fR
edit: Air temperature has been cold CAA/Greenland side of the Arctic so the heat must come from below.
« Last Edit: January 22, 2019, 12:03:26 AM by uniquorn »

Ice Shieldz

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Re: The 2018/2019 freezing season
« Reply #1052 on: January 22, 2019, 12:50:14 AM »
That and probably the thinness of the ice isn't helping matters any. Not as much wind needed to get things moving?  Your Jan 2013 - Dec 2018 piomas comparison used for an example.
« Last Edit: January 22, 2019, 12:57:02 AM by Ice Shieldz »

uniquorn

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Re: The 2018/2019 freezing season
« Reply #1053 on: January 22, 2019, 02:47:54 PM »
Freezing season isn't over yet ;)
A rough comparison of ascat and piomas, mar15-jan21, weekly (best efforts matching the dates) piomas only up to dec15
Thanks to wipneus, Zhang and Rothrock for piomas
edit: reposted as 8bit and replaced missing frames, 3MB, better colour representation on forum and date matching is better now For best results please download the animation


Some of the detail is lost in a weekly animation but most here will remember that a significant amount of the last of the MYI was pushed into the CAA. What little was left has been spread along the CAA and into the Beaufort.
Added latest cryosat for reference. Note that the cryosat footprint is small and the ice these days is very mobile, particularly in the Beaufort.
Postgrads or keen number crunchers looking for ideas might try cross referencing cryosat swaths with osisaf ice drift. That would be nice.

Ice Shieldz, please see the Nares thread, https://forum.arctic-sea-ice.net/index.php/topic,176.msg186710.html#msg186710
« Last Edit: January 22, 2019, 07:04:02 PM by uniquorn »

Sterks

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Re: The 2018/2019 freezing season
« Reply #1054 on: January 22, 2019, 07:07:03 PM »
Thanks for the great Animations

Niall Dollard

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Re: The 2018/2019 freezing season
« Reply #1055 on: January 23, 2019, 01:07:52 AM »
Re "broken up" Lincoln Sea. It isn't all that unusual, especially until the arches form in the Nares Strait.  Here's an image from 1st January 2014 before the arches formed that year. 

Niall Dollard

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Re: The 2018/2019 freezing season
« Reply #1056 on: January 23, 2019, 10:35:03 AM »
No sign yet of Nares Strait blocking up. I suspect that the thickness of the chunks breaking off in the Lincoln Sea is not helping matters. In former years thick blocks of MYI would break off and help stem the flow or even block the channel. In the past couple of years thinner ice is coming down. Nares did not block until March 1st last year. This year could be as late - if even at all if the wind persists from N or E.

oren

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Re: The 2018/2019 freezing season
« Reply #1057 on: January 23, 2019, 12:03:52 PM »
With choke points at both the Lincoln-Nares entry and in Kane basin, and with air temps of -30C, usually a few days come along of either a reverse wind or a slowdown due to too much ice squeezing through, thus overcoming the strong current and managing to freeze in place. So I think the probability is still on the side of an arch forming. But as the ice grows weaker and thinner, the long term prognosis is indeed towards a change in behavior at some point.
In 2007 no arch formed. I wonder if it's possible to generate an animation of the ice in the Lincoln Sea and along the strait that year. Not sure if the images exist.

uniquorn

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Re: The 2018/2019 freezing season
« Reply #1058 on: January 23, 2019, 01:30:45 PM »
Thanks for the comments on the Lincoln sea. I had expected hoped that with the very cold CAA weather early in the freezing season aided by additional cold from an SSW that the Nares might have closed by now. I suspect that warmer water from depth is keeping it open.
Another chunk gone today. https://go.nasa.gov/2UbhzxA

edit: Thought I'd compare those images. Where can I find older images than 2009?
Lincoln sea, added dec25 2009, jan01 2014, jan23 2019 (thanks Phil)

Note that these are, so far, randomly selected years.
« Last Edit: January 23, 2019, 06:14:25 PM by uniquorn »

Phil.

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Re: The 2018/2019 freezing season
« Reply #1059 on: January 23, 2019, 04:32:21 PM »


edit: Thought I'd compare those images. Where can I find more old images like that?
Lincoln sea, jan2014 and 2019

Try http://ocean.dmi.dk/arctic/kennedy.uk.php
DMI say that "There are 18615 images in the archive from 21-06-2009 to 23-01-2019".

johnm33

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Re: The 2018/2019 freezing season
« Reply #1060 on: January 23, 2019, 10:07:05 PM »
We all know the 21st was a full moon but

just change the year to check other likely dates http://www.calendar-12.com/moon_phases/2019

Aluminium

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Re: The 2018/2019 freezing season
« Reply #1061 on: January 24, 2019, 01:13:09 PM »
January 16-23.

The Kara Strait is still not frozen.

uniquorn

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Re: The 2018/2019 freezing season
« Reply #1062 on: January 25, 2019, 03:27:42 PM »
Worldview update on the Lincoln Sea with a bathymetry map from noaa. https://go.nasa.gov/2UgJYSV
Guess A: Some of the Atlantic water travelling south along the Lomonosov ridge heads south west at the Lincoln Sea, maintaining some of its southern momentum with a slower eastern momentum, but that is 'uphill' from depth.
Guess B: Water from the Beaufort side of the ridge as suggested by the later images.

A, B, both or neither?
worldview, lincoln sea, viirsbt15n, jan19-25 and noaa bathymetry map (2MB)
edit: added noaa scale
« Last Edit: January 25, 2019, 06:13:42 PM by uniquorn »

b_lumenkraft

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Re: The 2018/2019 freezing season
« Reply #1063 on: January 25, 2019, 04:13:56 PM »
My uneducated guess - using seafloor topography as a measure.

uniquorn

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Re: The 2018/2019 freezing season
« Reply #1064 on: January 26, 2019, 06:03:20 PM »
It's quite difficult to track individual ice features from freezing season to freezing season but I was curious about a dark line on ascat which also shows up on worldview viirs.
The first animation is ascat 2018074(mar15), 2018317(nov13) and 2019025(jan25).

During the 2017/18 freezing season what was left of the Wrangel arm rotated clockwise to the border of the ESS and the Laptev and some thick ice in the Laptev ended up close to Severnaya Zemlya, shown in the first frames.

In the Nov13 frame the rotation continues and the forked shape of the older ice can just about be identified, somewhat distorted. Unfortunately, surface melting during the summer gives the ice a scatter whitewash as far as ascat is concerned.

In yesterdays frame it is the dark line north east of Kap Morris Jessup that interested me. It appears to be related to the dark line of possibly lower concentration ice between the 2 features in the first frame.
The worldview ani is just to confirm the existence of the darker line and hopefully some thicker ice coming up north of Greenland.



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Re: The 2018/2019 freezing season
« Reply #1065 on: January 27, 2019, 04:07:12 PM »
That's a vigorous textbook transpolar, and the Gyre seemed active this winter ending its languish deceleration of the past three years. A timid return to "normal" winter followed by a super hot summer?

uniquorn

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Re: The 2018/2019 freezing season
« Reply #1066 on: January 27, 2019, 07:42:29 PM »
Yes, it's a lot of drift, though until the recent constant easterlies it could just be rotation. There's no real resistance on the atlantic side.
Looking at the Beaufort Gyre over the last few days reminded me of a post from johnm33 at the end of september.
"One can ask why the Pacific side has started to re-freeze"
It looks more like the ice is expanding/rotating into the Pacific side. Near the center of the ice cover there are desert conditions, bone dry air - freezing winds, whenever a crack opens it instantly freezes over, that slowly but surely expands the pack. As it moves south it loses ground to the planets rotation, about 25k per deg., in order to bypass the CAA shoreline it would need about another 10k. Tidal movement has been keeping the ice from becoming fast, thus every few hours it moves a little further south.
 Between the pole and the center of the pack the conflicting pressures forcing the ice in different directions adds to the number of leads to be flash frozen. On the Atl. side there's too much heat and too much wave action to allow the pack to expand, though nothing to stop it's exit through Fram. There appears to be a warm current flowing beneath Beaufort, from the NSI towards Lancaster/Amundsen keeping central Beaufort from freezing, and allowing wave action to continue on that front.
That current seems to be associated with a feature around 77N 172W. On hycom 'ice opening' it looks to be pulsed from below, possibly connected to tidal surges, creating massive shallow waves which are impacting the melt of ESS On 'sss' it shows up as fresher water/melt I'd expect more saline from below, so is the melt being forced south from beneath the ice? and although it mainly rotates ccw there are signs of counter rotation suggesting two different energy signatures.
This is the last day I expected any downturn so if any of this is relevent the freeze should gather pace come monday.

Note the tail of more mobile ice stretching away from the Beaufort.
worldview, viirsbt15n, jan24-27 (2.5MB)

Archimid

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Re: The 2018/2019 freezing season
« Reply #1067 on: January 27, 2019, 08:05:06 PM »
DMI N80 hit the mean line in winter for the first time since 2015.
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uniquorn

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Re: The 2018/2019 freezing season
« Reply #1068 on: January 28, 2019, 01:42:43 PM »
Following on in the series of drawing lines on night vision gifs here is a revision of what may be happening north of Greenland. Still an Atlantic incursion into the Lincoln Sea, but taking the short cut around the coast, similar to last July (with thicker ice).
analyses by uniquorn may turn out to be completely false and should not be used to impune the integrity of the ASIF community in any way

worldview, viirsbt15n, jan26-28  https://go.nasa.gov/2FUAoBX
amsr2-uhh, jul10-aug6
« Last Edit: January 28, 2019, 02:03:45 PM by uniquorn »

b_lumenkraft

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Re: The 2018/2019 freezing season
« Reply #1069 on: January 28, 2019, 02:32:18 PM »
Next big chunk nearing the Fram Strait might block it.

Or just shatter and do nothing.

Who places the bets here? ;)

uniquorn

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Re: The 2018/2019 freezing season
« Reply #1070 on: January 28, 2019, 04:07:01 PM »
Small supporting evidence from mercator (model) 92m current, dec1-jan27.

It looks like the ice front between Svalbard and FJL is in for a rough week.

oren

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Re: The 2018/2019 freezing season
« Reply #1071 on: January 28, 2019, 04:09:53 PM »
Next big chunk nearing the Fram Strait might block it.

Or just shatter and do nothing.

Who places the bets here? ;)
Shatter.
I doubt you'll find a taker for the other side of the bet...

b_lumenkraft

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Re: The 2018/2019 freezing season
« Reply #1072 on: January 28, 2019, 05:01:38 PM »
Next big chunk nearing the Fram Strait might block it.

Or just shatter and do nothing.

Who places the bets here? ;)
Shatter.
I doubt you'll find a taker for the other side of the bet...

Thanks for your bid!

In your opinion, is it because it's already cracked or is the current too strong or both?

oren

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Re: The 2018/2019 freezing season
« Reply #1073 on: January 28, 2019, 05:28:32 PM »
In your opinion, is it because it's already cracked or is the current too strong or both?
This has been discussed in the Nares Strait thread. To quote my betters, the floes lack the cohesive strength of previous decades and are probably an amalgamation of old ice glued with new ice, easily falling apart.

uniquorn

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Re: The 2018/2019 freezing season
« Reply #1074 on: January 28, 2019, 07:04:25 PM »
It's quite difficult to track individual ice features from freezing season to freezing season but I was curious about a dark line on ascat which also shows up on worldview viirs.
I tracked the line back to roughly day248, sep5 2018 and it looks like it goes from SZ area to the north pole. Does anyone here track icebreakers?  ;)
« Last Edit: January 28, 2019, 07:13:36 PM by uniquorn »

echoughton

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Re: The 2018/2019 freezing season
« Reply #1075 on: January 28, 2019, 08:03:43 PM »
DMI N80 hit the mean line in winter for the first time since 2015.

This is QUITE significant, I think. Not spozed to happen anymore.

Niall Dollard

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Re: The 2018/2019 freezing season
« Reply #1076 on: January 28, 2019, 08:12:24 PM »
DMI N80 hit the mean line in winter for the first time since 2015.

This is QUITE significant, I think. Not spozed to happen anymore.

Just a little below the line now.

uniquorn

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Re: The 2018/2019 freezing season
« Reply #1077 on: January 28, 2019, 09:12:03 PM »
and    it's up again

uniquorn

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Re: The 2018/2019 freezing season
« Reply #1078 on: January 28, 2019, 09:15:36 PM »
Next big chunk nearing the Fram Strait might block it. Or just shatter and do nothing.Who places the bets here? ;)
I'll take a sportsman's bet on the big chunk at the entrance now. That it makes it down the strait.
and think about the one after that....

Laymans explanation: Some pressure differences often mentioned on this forum mean that water nearly always flows from Lincoln to Baffin. Water from 100m depth or more may always have been forced close to the surface at the entrance to the Nares but this year the ice is thinner and perhaps more importantly, younger. It behaves in the way shown in this and previous animations, which show it better than I can describe in words.
Temperature difference is over 34C between ice and ocean at surface, air temperatures reportedly -30C or less for weeks but the ice still breaks up. Conclusion is that a lot of probably -0.5C or warmer water is weakening the ice from below.

Yesterday big chunk was weakened at the front and lost its rear right end due to collisions.
Today it lost its rear left and its front right wing, but it is more streamlined for the journey ahead.

https://go.nasa.gov/2UukbqH
edit: corrected Kelvin temperatures
« Last Edit: January 29, 2019, 03:25:58 PM by uniquorn »

Wherestheice

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Re: The 2018/2019 freezing season
« Reply #1079 on: January 29, 2019, 01:55:02 AM »
DMI N80 hit the mean line in winter for the first time since 2015.

This is QUITE significant, I think. Not spozed to happen anymore.

I wouldn't call it significant at all frankly. Weather is variable, even more so in the Arctic.
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oren

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Re: The 2018/2019 freezing season
« Reply #1080 on: January 29, 2019, 03:33:03 AM »
DMI N80 hit the mean line in winter for the first time since 2015.
2018 around day 80 also managed to get under the mean DMI N80 line briefly.

Neven

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Re: The 2018/2019 freezing season
« Reply #1081 on: January 29, 2019, 09:54:39 AM »
Shutdown over, data back, December 2018 surface air temperatures pretty much run-of-the-mill (6th highest on record):
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uniquorn

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Re: The 2018/2019 freezing season
« Reply #1082 on: January 29, 2019, 11:06:51 AM »
With the january poll deadline coming up, here are a couple of seas not fully included in Aluminium's regular postings.
Worldview, terra modis, bering, jan28
amsr2-uhh, baffin etc and okhotsk, jan23-28.
« Last Edit: January 29, 2019, 11:14:22 AM by uniquorn »

Sterks

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Re: The 2018/2019 freezing season
« Reply #1083 on: January 29, 2019, 02:28:05 PM »
Uniquorn, in your previous post of Nares should yellow be warmer than blue?

uniquorn

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Re: The 2018/2019 freezing season
« Reply #1084 on: January 29, 2019, 03:29:26 PM »
Uniquorn, in your previous post of Nares should yellow be warmer than blue?
thanks for that, a true sportsman  :)

Phil.

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Re: The 2018/2019 freezing season
« Reply #1085 on: January 29, 2019, 07:01:44 PM »
DMI N80 hit the mean line in winter for the first time since 2015.

This is QUITE significant, I think. Not spozed to happen anymore.

For it not to happen at all would imply that the current average is about 3 SD+ above the longer term mean.

Shared Humanity

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Re: The 2018/2019 freezing season
« Reply #1086 on: January 29, 2019, 08:45:48 PM »
DMI N80 hit the mean line in winter for the first time since 2015.

This is QUITE significant, I think. Not spozed to happen anymore.

For it not to happen at all would imply that the current average is about 3 SD+ above the longer term mean.

Thanks for this...really very simple. It is actually quite amazing how seldom the temps approach the long term mean.

Thomas Barlow

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Re: The 2018/2019 freezing season
« Reply #1087 on: January 30, 2019, 12:49:48 AM »
With the january poll deadline coming up
Where's the poll?
Thanks.

Archimid

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Re: The 2018/2019 freezing season
« Reply #1088 on: January 30, 2019, 03:02:42 AM »
2018 around day 80 also managed to get under the mean DMI N80 line briefly.

That is true, but since by day 80 the mean temperature is already inflecting I see it as the beginning of spring not winter. 
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Paddy

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Re: The 2018/2019 freezing season
« Reply #1089 on: January 30, 2019, 08:09:40 AM »
With the january poll deadline coming up
Where's the poll?
Thanks.

Here:https://forum.arctic-sea-ice.net/index.php/topic,2535.0.html

uniquorn

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Re: The 2018/2019 freezing season
« Reply #1090 on: January 30, 2019, 01:06:58 PM »
A queue forming in the Nares as a roughly 15km floe scrapes past the Petermann. That must be amazing to see on the ground. How to calculate roughly the volume of -0.5C water to melt a floe, say 15km square, 2m thick?
Big Chunk has released the nacelle section (she canna take no more capn).
Inset right shows mist (I think) clearing off the Petermann Gletscher where the area of a possible future calving (circled) is just visible in the last frames.
see Tealight, https://forum.arctic-sea-ice.net/index.php/topic,53.msg187370.html#msg187370

edit:forgot dates
worldview, viirs,bt15n, nares, jan28-30
« Last Edit: January 30, 2019, 01:35:56 PM by uniquorn »

uniquorn

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Re: The 2018/2019 freezing season
« Reply #1091 on: January 30, 2019, 06:29:08 PM »
The old ice front doesn't quite make it over the Svalbard, FJL, SZ line.
Southerlies already affecting the new ice in the barents this week.
Jaxa, oct24-jan29

edit: The new worldview brightness temperature palettes are good. https://go.nasa.gov/2FY7kK7
« Last Edit: January 31, 2019, 03:01:08 PM by uniquorn »

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Re: The 2018/2019 freezing season
« Reply #1092 on: January 30, 2019, 10:42:03 PM »
Good to see the ESRL back up to date again.

https://www.esrl.noaa.gov/psd/forecasts/seaice/

This chart looks pretty much the way I would have expected from where we left off before the shutdown.

Kara/Barents very thin <0.5m

Laptev is continuing to slowly thicken. Most about 1.3m.  How long will it be before it all turns "pink".

There is a large tongue of old ice (>1.5m) north of Alaska. 

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Re: The 2018/2019 freezing season
« Reply #1093 on: February 01, 2019, 12:59:31 AM »
Laptev is continuing to slowly thicken. Most about 1.3m.  How long will it be before it all turns "pink".

It might not. If the entire atlantic side continues its considerable drift  towards Greenland, it will be a close call. There is ice formation of course, but it is exporting laptev quite rapidly.
big time oops

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Re: The 2018/2019 freezing season
« Reply #1094 on: February 01, 2019, 01:24:45 AM »
Windy ecmwf wave forecast feb1

johnm33

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Re: The 2018/2019 freezing season
« Reply #1095 on: February 01, 2019, 12:42:58 PM »
There's a sheer line in the compressive strength of the ice, it points towards Prince Patrick is. but may be seen as terminating in Mclure or by Banks is. I wondered if it would actually show up on the ice, there's a diagonal line of leads opening across the polarview image which seem a close match.
 

I'm guessing the parallel waves[?] are tidal surges coming in from the Pacific.

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Re: The 2018/2019 freezing season
« Reply #1096 on: February 01, 2019, 03:17:24 PM »
DMI N80 hit the mean line in winter for the first time since 2015.

This is QUITE significant, I think. Not spozed to happen anymore.

Just a little below the line now.

I'd like to see these DMI graphs with only the last 5 - 10 yr average.
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Re: The 2018/2019 freezing season
« Reply #1097 on: February 01, 2019, 10:49:42 PM »
Something else from DMI. Warm arm reaching towards the Pole (not as spectacular as previous events):
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E. Smith

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Re: The 2018/2019 freezing season
« Reply #1098 on: February 02, 2019, 09:10:27 AM »
A lot of warmth in the Pacific Gateway, the Atlantic front and even Baffin Bay. Freezing delayed or even reversed in the peripheral seas for a couple of more days?
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Re: The 2018/2019 freezing season
« Reply #1099 on: February 02, 2019, 12:28:04 PM »
Windy ecmwf wave forecast, bering, feb2-11